My Great Grandfather was Johann Anton Kaemmerer. After his entry into the US at his enlistment as a volunteer in the Mo Light Artillery, His name was recorded on the enlistment papers as Anton John Kaemmerer. Thats all I know, do not know why it was done that way. All subsequent recordings of any official nature, listed him as John Anton or Just John Kaemmerer. Two or three US Census's list him as John. His marriage lists him as John Anton. Joe